U.S. patent application number 15/309853 was filed with the patent office on 2017-05-25 for device and method for controlling an injection valve.
This patent application is currently assigned to Continental Automotive GmbH. The applicant listed for this patent is Continental Automotive GmbH. Invention is credited to Frank Denk.
Application Number | 20170145942 15/309853 |
Document ID | / |
Family ID | 52774221 |
Filed Date | 2017-05-25 |
United States Patent
Application |
20170145942 |
Kind Code |
A1 |
Denk; Frank |
May 25, 2017 |
Device and Method for Controlling an Injection Valve
Abstract
The present disclosure relates to injection valves. The
teachings thereof may be embodied in various valves, fuel
injectors, and methods for controlling valves. An example method
for setting operational parameters of a fuel injector may include:
determining a measurement-specific maximum current value; applying
a voltage pulse to the coil drive of the fuel injector; detecting a
time curve of the current intensity of a current flowing through
the coil drive; ending the voltage pulse when the detected current
intensity reaches the maximum current value; and storing the time
curve of the detected current intensity. The method may include
generating a plurality of differential curves each based on two
stored time curves of the detected current intensity for successive
measurements; determining a peak current for driving the actuator
of the fuel injector based at least in part on the plurality of
differential curves; and operating the coil at the determined peak
current.
Inventors: |
Denk; Frank; (Obertraubling,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Continental Automotive GmbH |
Hannover |
|
DE |
|
|
Assignee: |
Continental Automotive GmbH
Hannover
DE
|
Family ID: |
52774221 |
Appl. No.: |
15/309853 |
Filed: |
March 25, 2015 |
PCT Filed: |
March 25, 2015 |
PCT NO: |
PCT/EP2015/056402 |
371 Date: |
November 9, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F02D 2041/2055 20130101;
F02D 41/2467 20130101; F02D 41/247 20130101; F02D 41/20 20130101;
F02D 2041/2013 20130101; F02D 41/248 20130101; F02D 2041/2058
20130101 |
International
Class: |
F02D 41/24 20060101
F02D041/24; F02D 41/20 20060101 F02D041/20 |
Foreign Application Data
Date |
Code |
Application Number |
May 9, 2014 |
DE |
10 2014 208 753.8 |
Claims
1. A method for setting operational parameters of a fuel injector
for an internal combustion engine of a motor vehicle, the fuel
injector having a coil drive for moving a closing element, the
method comprising: carrying out a plurality of measurements,
wherein each measurement comprises: determining a
measurement-specific maximum current value; applying a voltage
pulse to the coil drive of the fuel injector; detecting a time
curve of the current intensity of a current flowing through the
coil drive; ending the voltage pulse when the detected current
intensity reaches the maximum current value; and storing the time
curve of the detected current intensity; generating a plurality of
differential curves each based on two stored time curves of the
detected current intensity for successive measurements; determining
a peak current for driving the actuator of the fuel injector based
at least in part on the plurality of differential curves; and
operating the coil at the determined peak current.
2. The method as claimed in claim 1, wherein each measurement of
the plurality of measurements further comprises: detecting a time
curve of the movement of the closing element; and storing the time
curve of the detected movement; and wherein determining the peak
current for the fuel injector depends at least in part on the time
curves of the detected movement.
3. The method as claimed in claim 1, wherein determining the peak
current for the fuel injector includes determining saturation
current value at which the fuel injector is in saturation.
4. The method as claimed in claim 1, wherein determining a
measurement-specific maximum current value includes increasing the
measurement-specific maximum current value for a following
measurement by a predetermined value as compared with the
measurement-specific maximum current value of the immediately
preceding measurement.
5. The method as claimed in claim 1, further comprising generating
a graphic representation of the time curves of the detected current
intensities, the time curves of the detected movements, and the
plurality of differential curves, and wherein the graphic
representation includes a reference point for the time in each
measurement at which the voltage pulse was ended.
6. A device for ascertaining parameter values for a fuel injector
for an internal combustion engine of a motor vehicle, said fuel
injector having a coil drive for moving a closing element, the
device comprising: an application unit for applying a voltage pulse
to the coil drive of the fuel injector; a detection unit for
detecting a time curve of the current intensity of a current
flowing through the coil drive or a time curve of the movement of
the closing element; a memory for storing the detected time curves;
and a processor for: determining a plurality of differential curves
based on stored time curves of the detected current intensities;
generating a plurality of differential curves each based on two
stored time curves of the detected current intensity for successive
measurements; and determining a peak current for driving the
actuator of the fuel injector based at least in part on the
plurality of differential curves.
7. A motor controller for an internal combustion engine of a motor
vehicle, the internal combustion engine comprising at least one
fuel injector having a coil drive for moving a closing element, the
device comprising: an application unit for applying a voltage pulse
to the coil drive of the fuel injector; a detection unit for
detecting a time curve of the current intensity of a current
flowing through the coil drive or a time curve of the movement of
the closing element; a memory for storing the detected time curves;
and a processor for: determining a plurality of differential curves
based on stored time curves of the detected current intensities;
generating a plurality of differential curves each based on two
stored time curves of the detected current intensity for successive
measurements; and determining a peak current for driving the
actuator of the fuel injector based at least in part on the
plurality of differential curves; wherein the application unit
operates the coil at the determined peak current.
8. A computer program for ascertaining parameter values for a fuel
injector for an internal combustion engine of a motor vehicle, the
fuel injector having a coil drive for moving a closing element,
wherein the computer program, when it is executed by a processor,
is configured to carry out a method comprising: carrying out a
plurality of measurements, wherein each measurement comprises:
determining a measurement-specific maximum current value; applying
a voltage pulse to the coil drive of the fuel injector; detecting a
time curve of the current intensity of a current flowing through
the coil drive; ending the voltage pulse when the detected current
intensity reaches the maximum current value; and storing the time
curve of the detected current intensity; generating a plurality of
differential curves each based on two stored time curves of the
detected current intensity for successive measurements; determining
a peak current for driving the actuator of the fuel injector based
at least in part on the plurality of differential curves; and
operating the coil at the determined peak current.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a U.S. National Stage Application of
International Application No. PCT/EP2015/056402 filed Mar. 25,
2015, which designates the United States of America, and claims
priority to DE Application No. 10 2014 208 753.8 filed May 9, 2014,
the contents of which are hereby incorporated by reference in their
entirety.
TECHNICAL FIELD
[0002] The present disclosure relates to injection valves. The
teachings thereof may be embodied in various valves, fuel
injectors, and methods for controlling valves.
BACKGROUND
[0003] During operation of fuel injectors with coil drive, because
of electrical, magnetic, mechanical, and hydraulic tolerances,
different chronological opening and closing responses of the
individual injectors and thus variations in the respective
injection volume occur. The relative injection volume differences
from injector to injector increase as the injection times become
shorter and shorter. When injection volumes are large, these
relative volume differences are small and without practical
significance. The development in the direction of smaller injection
volumes and times, however, renders it no longer possible to
disregard the influence of the relative volume differences.
Therefore, it is of great importance to know the characteristic
properties of a given fuel injector individually and precisely, so
that these can be considered when driving the fuel injector.
SUMMARY
[0004] The teachings of the present disclosure may be embodied in a
method for ascertaining parameter values for a fuel injector for an
internal combustion engine of a motor vehicle, said fuel injector
having a coil drive for moving a closing element. Some embodiments
may include a corresponding device, a motor controller, and a
computer program. The teachings may enable ascertaining relevant
parameter values for a fuel injector, so that the latter can be
driven precisely.
[0005] Some embodiments may include a method for ascertaining
parameter values for a fuel injector for an internal combustion
engine of a motor vehicle, said fuel injector having a coil drive
for moving the closing element. The method may include carrying out
a plurality of measurements. Each measurement may include:
determining a measurement-specific maximum current value, applying
a voltage pulse to the coil drive of the fuel injector, detecting a
time curve of the current intensity (112, 114) of a current flowing
through the coil drive, ending the voltage pulse when the detected
current intensity reaches the maximum current value, and storing
the time curve of the detected current intensity. The method may
further include: determining a plurality of differential curves
(122, 124), wherein each differential curve is based on the stored
time curves of the detected current intensity for two successive
measurements, and determining a parameter value for the fuel
injector on the basis of the plurality of differential curves.
[0006] In some embodiments, each measurement of the plurality of
measurements further has detection of a time curve of the movement
(132, 134) of the closing element, and storage of the time curve of
the detected movement, and the determination of the parameter value
for the fuel injector is further based on the time curves of the
movement.
[0007] In some embodiments, the determination of the parameter
value for the fuel injector has a determination of a saturation
current value, at which the fuel injector is in saturation.
[0008] In some embodiments, the determination of a
measurement-specific maximum current value is carried out in such a
way that the measurement-specific maximum current value for a
following measurement is increased by a predetermined value as
compared with the measurement-specific maximum current value of the
immediately preceding measurement.
[0009] Some embodiments may include generation of a graphic
representation of the time curves of the detected current
intensities, the time curves of the detected movements and the
plurality of differential curves, wherein the graphic
representation is configured such that the time in each measurement
at which the voltage pulse was ended constitutes a reference point.
Some embodiments may include a device for ascertaining parameter
values for a fuel injector for an internal combustion engine of a
motor vehicle, said fuel injector having a coil drive for moving a
closing element. The device may include: an application unit for
applying a voltage pulse to the coil drive of the fuel injector, a
detection unit for detecting a time curve of the current intensity
of a current flowing through the coil drive and/or a time curve of
the movement of the closing element, a storage unit for storing the
detected time curves, and a determination unit for determining a
plurality of differential curves based on stored time curves of the
detected current intensities, and a control unit which is
configured to carry out the method as claimed in one of the
preceding claims.
[0010] Some embodiments may include a motor controller for an
internal combustion engine of a motor vehicle configured to carry
out one or more of the methods as described above.
[0011] Some embodiments may include a computer program for
ascertaining parameter values for a fuel injector for an internal
combustion engine of a motor vehicle, said fuel injector having a
coil drive for moving a closing element, configured to carry out
one or more of the methods as describe above.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 shows a graphic representation, generated in
accordance with the teachings of the present disclosure, of
appropriate current curves, movement curves, and current
differential curves for a fuel injector as a function of time in
conjunction with an exemplary embodiment.
DETAILED DESCRIPTION
[0013] Some embodiments may include a method for ascertaining
parameter values for a fuel injector for an internal combustion
engine of a motor vehicle is described, said fuel injector having a
coil drive for moving a closing element. The method may include:
(a) carrying out a plurality of measurements, wherein for each
measurement (a1) a measurement specific maximum current value is
determined, (a2) a voltage pulse is applied to the coil drive of
the fuel injector, (a3) a time curve of the current intensity of a
current flowing through the coil drive is detected, (a4) the
voltage pulses are terminated when the detected current intensity
of the maximum current value is attained, and (a5) the time curve
of the detected current intensity is stored, (b) determining a
plurality of differential curves, each differential curve being
based on the stored time curves of the detected current intensities
for two successive measurements, and (c) determining a parameter
value for the fuel injector on the basis of the plurality of
differential curves.
[0014] The time curve of the current intensity during an opening
operation of a fuel injector (in which the coil drive has a voltage
pulse (boost voltage) applied thereto) depends on the inductance of
the coil drive. In addition to the changing inherent inductance of
the coil drive (because of the nonlinear ferromagnetic magnetic
material), there is a movement inductance component resulting from
the armature movement. The movement inductance component begins
with the beginning of the opening phase (armature/needle movement
begins) and ends at the end of the opening phase (armature/needle
movement ends). If, then, this injector is operated with different
current profiles which behave in a time similar manner in their
currents, in the event of variations in the level of the magnitude
of the current, the inductive influence and the change thereof will
change characteristically. With the method described, different
items of information, e.g., parameter values, which can be used for
characterization of the present fuel injector, can be determined
both automatically and also manually by means of inspection.
[0015] In this document, "voltage pulse" designates in particular a
so-called boost voltage pulse, which is suitable to open the fuel
injector within a short time.
[0016] In this document, "closing element" designates a movable
element of the fuel injector which can be moved by the coil drive
in order to open and to close the fuel injector.
[0017] In some embodiments, following the application of the
respective voltage pulse, the injector may be kept open for a time
period during an injection phase. The detection of the time curve
of the current intensity may be carried out both during the
application of the respective voltage pulse (e.g., during the boost
phase) and thereafter (e.g., during the injection phase and/or
closing phase).
[0018] It is characteristic of each measurement that the voltage
pulse is switched off at the time at which the current intensity
reaches a defined measurement-specific maximum current value (peak
current). In other words, a unique maximum current value may be
used for each measurement. Switching off the voltage pulse leads to
the fuel injector changing to a freewheeling phase, in that a lower
voltage (for example ground, vehicle electrical voltage or another
defined voltage) is imposed on the coil drive.
[0019] By determining a plurality of differential curves, wherein
each differential curve is based on the stored time curves of the
detected current intensities for two successive measurements, it is
possible to detect whether the corresponding difference in the
maximum current value (peak current) has a greater or rather lesser
influence on the time curve of the current intensity. In other
words, it is possible to detect the extent to which a change in the
peak current value when driving the fuel injector will have a
substantial effect on the time curve of the current intensity (in
all or in part of the time interval).
[0020] By means of evaluating and analyzing the differential
curves, it is possible to determine various items of information
which can be used for characterization of the fuel injector. More
specifically, information in relation to eddy current
characteristics, in relation to the magnetization behavior as far
as saturation and to the behavior beyond that as far as over
excitation can be detected. The information and/or parameter values
determined in this way then permit/s precise adaptation of the
drive parameters, so that the fuel injector operates as
desired.
[0021] In some embodiments, each measurement of the plurality of
measurements further has (a) detection of a time curve of the
movement of the closing element and (b) storage of the time curve
of the detected movement, wherein the determination of the
parameter value for the fuel injector is also based on the time
curves of the detected movement. The movement of the closing
element can be detected, for example, by means of an acceleration
sensor. By means of analysis of the time curves of the movement of
the closing element for the various maximum current values (or peak
current values), it is possible, for example, to detect whether a
characteristic state of the fuel injector (for example end of the
opening phase) is reached before or after the ending of the voltage
pulse. Thus, for example, an optimal peak current value for driving
the fuel injector can be defined.
[0022] In some embodiments, the determination of the parameter
value for the fuel injector has a determination of a saturation
current value, at which the fuel injector is in saturation.
[0023] In this document "saturation" designates a state in which a
further increase in the coil current does not concomitantly lead to
a corresponding further movement of the movement element of the
fuel injector.
[0024] The saturation current value can be found by analyzing the
differential curves, e.g., by comparing the differential curves. If
two or more successive differential curves run very similarly, this
is an indication that the fuel injector is in saturation at the
corresponding peak current values.
[0025] In some embodiments, the definition of a
measurement-specific maximum current value is carried out in such a
way that the measurement-specific maximum current value for a
following measurement is increased by a predetermined value as
compared with the measurement-specific maximum current value of the
immediately preceding measurement. In other words, the
measurement-specific maximum current value is increased
step-by-step for each measurement.
[0026] The predetermined value with which the measurement-specific
maximum current is increased step-by-step is, for example, 0.1 A to
1 A, such as for example 0.25 A to 0.75 A, such as for example
about 0.5 A. The measurement-specific maximum current value for the
first measurement may be, for example, 5 A and, for the last
measurement, for example 15 A.
[0027] In some embodiments, the method further has generation of a
graphic representation of the time curves of the detected current
intensities, the time curves of the detected movements and the
plurality of differential curves, wherein the graphic
representation is configured such that the time in each measurement
at which the voltage pulse was ended constitutes a reference point.
Expressed in another way, the time curves of the current
intensities and movements and the differential curves are
represented as functions of time such that the values which
correspond to the time at which the voltage pulse in the respective
measurements was ended are represented above one another (i.e. for
a specific value (for example t=0) on the time axis). The
individual curves can, for example, be identified in color, so that
the assignment of the various curves to the various values of the
peak current is made easier.
[0028] This representation permits a person skilled in the art to
descry much information in relation to the properties of the fuel
injector. In addition to the aforementioned saturation of the fuel
injector, the person skilled in the art can, amongst other things,
detect the eddy current characteristics and the behavior of the
fuel injector when overexcited. Furthermore, the person skilled in
the art can make statements about the magnetic material used with
regard to conductivity and hysteresis curve, and detect
characteristic points of the armature positions. Therefore,
adaptation with regard to the optimum current profile and the
hydraulic behavior is possible. The event times (start/end of the
opening/closing operation) can be placed as a function of pressure
in current ranges that are needed/usable for the detection.
[0029] This adaptation thus also defines a hardware-optimized and
cost-optimized current controller. As a result of knowledge of the
event times, the injection volume can be set more accurately by
adapting the energization period.
[0030] If, for example, it is established that the start of the
opening operation is time-shifted, the starting time of the voltage
pulse which is applied to the coil drive can be shifted
appropriately. If, for example, it is established that the end of
the opening operation is time-shifted, the injection period can be
adapted in order to ensure that the envisaged fuel quantity is
injected. In other words, the time period of the voltage pulse in
the event of delayed opening of the fuel injector can be lengthened
in order to avoid too little fuel being injected. In a similar way,
the time period of the voltage pulse in the case of premature
opening of the fuel injector can be shortened, in order to avoid
too much fuel being injected.
[0031] The aforementioned corrections can advantageously be carried
out in a pulse-individual manner, which means for each individual
opening operation. The corrections and time shifts can also take
into account physical system parameters, such as fuel temperature,
distance from the previous injection operation and so on. This can
be done, for example, by using appropriate pilot control
characteristic curves or maps or a model.
[0032] Some embodiments may include a device for ascertaining
parameter values for a fuel injector for an internal combustion
engine of a motor vehicle, said fuel injector having a coil drive
for moving a closing element. The device described has the
following: (a) an application unit for applying a voltage pulse to
the coil drive of the fuel injector, (b) a detection unit for
detecting a time curve of the current intensity of a current
flowing through the coil drive and/or a time curve of the movement
of the closing element, (c) a storage unit for storing the detected
time profiles, (d) a determination unit for determining a plurality
of differential curves based on stored time curves of the detected
current intensities, and (e) a control unit which is configured to
carry out the method according to the first aspect or one of the
above-described embodiments.
[0033] The device described is based substantially on the same idea
as has been described above in conjunction with the methods. The
device described thus constitutes a hardware implementation of the
method. The application unit and detection unit can thus be
implemented with conventional voltage generators and current
measuring devices known from the field of motor control. In a
similar way, the storage unit, determination unit and control unit
can be implemented with conventional storage and processing units
(microprocessor) of a motor controller. The device makes possible a
simple, precise and economical acquisition of characteristic
parameter values for a fuel injector, in particular the
determination of a suitable current profile for driving the fuel
injector.
[0034] Some embodiments may include a motor controller for a
vehicle. The motor controller described is configured to carry out
the methods described above. This motor controller permits
characteristic parameters of the individual fuel injectors to be
acquired and taken into account with simple and economical
means.
[0035] Some embodiments may include a computer program for
acquiring parameter values for a fuel injector for an internal
combustion engine of a motor vehicle, said fuel injector having a
coil drive for moving a closing element. The computer program
described is configured to carry out the methods described above
when it is executed by a processor or .mu.-controller.
[0036] In the sense of this document, the naming of such a computer
program is equivalent to the concept of a program element, a
computer program product and/or a computer-readable medium which
contains instructions for controlling a computer system to
coordinate the operation of a system or a method in a suitable way
in order to achieve the effects linked with the methods described
herein. The computer program can be implemented as
computer-readable instruction code in any suitable programming
language such as, for example, in Assembler, Java, C++, etc. The
computer program can be stored on a computer-readable storage
medium (CD-ROM, DVD, Blu-ray disk, removable drive, volatile or
nonvolatile memory, incorporated memory/processor, etc.). The
instruction code can program a computer or other programmable
devices such as in particular a control device for a motor of a
motor vehicle in such a way that the desired functions are
executed. Furthermore, the computer program can be provided in a
network, such as the Internet, for example, from which it can be
downloaded as required by a user.
[0037] The invention can be implemented both by means of a computer
program, i.e. software, and by means of one or more specific
electric circuits, i.e. in hardware, or in any desired hybrid form,
i.e. by means of software components and hardware components.
[0038] It is pointed out that embodiments of the invention have
been described with reference to different subjects of the
invention. In particular, some embodiments of the invention are
described with method claims and other embodiments of the invention
with device claims. However, it will immediately become clear to
the person skilled in the art, when reading this application, that,
if not explicitly otherwise specified, in addition to a combination
of features which belong to one type of subject of the invention,
any desired combination of features which belong to different types
of subject of the invention is also possible.
[0039] FIG. 1 shows a series 110 of current curves, a series 120 of
current differential curves, and a series 130 of movement curves
for a fuel injector as functions of time according to an exemplary
embodiment.
[0040] Each curve in the series 110 of current curves shows the
current curve when a voltage pulse of 65 V (boost voltage) is
applied to a fuel injector until a specific (measurement-specific)
current intensity (maximum current value) between about 6 A and
about 15 A is reached. In other words, each curve in the series 110
of current curves corresponds to precisely one of a plurality of
measurements. The reference point used for the curves is the time
at which the measurement-specific maximum current value is reached.
This time is shown as t=0. Thus, the lower curve 112 shows the
current curve for a first measurement, in which the
measurement-specific maximum current value is about 6 A. The curve
precisely above the lower curve 112 shows the current curve for a
second measurement, at which the measurement-specific maximum
current value is higher by 0.5 A, and so on. The upper curve 114
shows the current curve from the last measurement, at which the
measurement-specific maximum current value is about 15 A.
[0041] Each curve in the series 120 of current differential curves
shows a calculated difference between two adjacent current curves
in the series 110 of current curves. In other words, each curve in
the series 120 shows the difference between the detected current
curves in two successive measurements, wherein the current curves
(as mentioned above) are synchronized with starting point at the
time at which the respective measurement-specific maximum current
value was reached. The curve 122 shows, for example, the difference
between the two lowest curves in the series 110 of current curves,
i.e., between the second curve from bottom and the bottom curve
112. In a similar way, the curve 124 shows the difference between
the two uppermost curves in the series 110 of current curves, i.e.,
between the upper curve 114 and the curve running just below the
latter.
[0042] Each curve in the series 130 of movement curves shows the
time curve of the starting voltage of an acceleration sensor in
conjunction with one of the measurements. The acceleration sensor
is fitted in the fuel injector to detect the movement of a relevant
part, such as a coil module or an injector needle, for example.
Each curve in the series 130 thus corresponds to a coil current
curve from the series 110. The movement curve 132 thus corresponds
to the first measurement, i.e., the coil current curve 112, and the
movement curve 134 corresponds to the last measurement, i.e., the
coil current curve 114.
[0043] The series 110, 120, 130 of curves shown in FIG. 1 can be
evaluated both in an automated manner and/or manually.
[0044] In particular, an automated evaluation by means of a
processor can be used to ascertain a suitable peak current (maximum
current value) for driving the fuel injector. This can be done,
firstly, by analyzing the series of curves 120 and secondly by
analyzing the series of curves 130. For instance, a comparison of
adjacent differential curves in the series of curves 120 provides
information as to whether the fuel injector is being operated in
saturation. If the differential curves run relatively constantly
and superimposing on one another, it can be assumed that the fuel
injector is in saturation. Since this is associated with a waste
both of time and of energy, a peak current at which this is not the
case should be selected. Furthermore, it can be determined, for
example, whether the opening of the fuel injector takes place
expediently relative to the current profile. As indicated by arrow
135, the movement curve 134 has a maximum value before t=0, which
is a further indication that the current curve 114 drives the fuel
injector in saturation. The processor looks for that curve from the
series of curves 130 which has its maximum value as close as
possible to t=0, in order to identify a suitable peak current for
the operation of the fuel injector. The precision can possibly be
increased further by interpolation.
[0045] A manual evaluation by user can be carried out by studying
the three series of curves 110, 120, 130 on a monitor. The graphic
representation can advantageously be carried out in color, for
example by curves in the three series of curves 110, 120, 130 which
correspond to specific maximum current values also having the same
color. This representation permits a user having specialist
knowledge to descry a lot of information in relation to the
properties of the fuel injector. In addition to the saturation of
the fuel injector described above, the user can amongst other
things detect the eddy current characteristics and the response of
the fuel injector when overexcited. Furthermore, the user can make
statements about the magnetic material used with regard to
conductivity and hysteresis curve, and detect characteristic points
of the armature positions. Thus, adaptation with regard to the
optimal current profile and the hydraulic behavior is possible. The
event times (start/end of the opening/closing operation) can be
placed as a function of pressure in current ranges needed/usable
for the detection. This adaptation thus also defines a
hardware-optimized and cost-optimized current controller. Finally,
with knowledge of the event times, the injection volume can be set
more accurately by adapting the energization period.
LIST OF DESIGNATIONS
[0046] 110 Current curves [0047] 112 Current curve [0048] 114
Current curve [0049] 120 Current differential curves [0050] 122
Current differential curve [0051] 124 Current differential curve
[0052] 130 Movement curves [0053] 132 Movement curve [0054] 134
Movement curve [0055] 135 Arrow
* * * * *